Exercise 1.1 (Perimeter of the rectangle and square)

Exercise 1.1

1. How much wire will be needed to make a rectangle of length 6 cm and breadth 3 cm?

Length of the rectangle = 6cm

Breadth of the rectangle = 3cm

Perimeter of rectangle = (2×1) + (2×b)

= (2×6) + (2×3)

= 12 + 6

= 18cm

Answer: 18cm of wire will be needed.

2. If the length of a rectangle is 14 m and its breadth is 10 m, what is its perimeter?

Length of the rectangle = 14 m

Breadth of the rectangle = 10 m

Perimeter of rectangle = (2×1) + (2×b)

= (2×14) + (2×10)

= 28 + 20

= 48 m

Answer: Perimeter of rectangle = 48m.

3. Each side of a square is 7 m long. Find its perimeter.

Side of a square = 7m

Perimeter of a square = 4a

= 4×7

= 28m

Answer: Perimeter of a square = 28m

4. If we take 2 rounds of a field, that is 340 m long and 160 m wide. Find the distance covered in kilometers?

Length of the field = 340m

Breadth of the field = 160m

Perimeter = (2×1) + (2×b)

= (2 × 340) + (2 × 160)

= 680 + 320

Distance for 1 round = 1000m

Distance for 2 rounds = 1000×2 = 2000m

1Km = 1000m

Distance covered in kilometers = 2000 ÷ 1000 = 2 km

Answer: Distance covered in kilometers = 2Km

5. Sanju completes 10 rounds around a square park every day. If one side of the park is 110 m, then find the distance covered by sanju in a day in terms of kilometers and metres.

Side of a square park 110cm

Distance covered = Perimeter

Perimeter = 4a

= 4 × 110 = 440m

Distance for one round = 440m

Distance for 10 round = 440 × 10 = 4400m

Distance for 10 round in kilometers = 4400÷1000 = 4km 400m

Answer: Distance covered in a day in terms of kilometers = 4 km 400m

Meters = 4400m

Answer:

Exercise 1.1

1. 18 cm

2. 4.8 cm

3. 2.8 cm

4. 1 km

5. 4400 m